import turtle

t = turtle.Turtle()
t.pensize(10)
t.speed(10)
a = ['red', 'orange', 'yellow', 'green', 'blue', 'purple']

x = 100
for i in range(5):
    t.penup()
    t.goto(x, 0)
    t.pendown()
    t.seth(90)
    t.color(a[i])
    t.circle(x, 180)
    x = x - 10

turtle.done()